Tool-holder for lathes.



PATENTBD MAR. 3, 1903.

T. B. TIEPBNBAGHER. TOOL HOLDER FOR LATHES.

AP PLIOATION IILE D OUT. 1, 1902.

N0 MODEL.

UNITED STATES FATENT OFFICE.

THOMAS B. TIEFENBACHER, OF NEV YORK, N. Y.

TOOL-HOLDER FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 721,979, dated March 3,1903. Application filed October I 1902. Serial No. 125.483. (No model.)

Too/Z7 whom it may concern:

Be it known that I, THOMAS E. TIEFEN- BAOHER, a citizen of the UnitedStates, residing in New York, borough of Manhattan, and State of NewYork, have invented certain new and useful Improvements in Tool- Holdersfor Lathes, of which the following is a specification.

This invention relates to an improved toolholder for lathes which issupported in the slide-rest in such a manner'as to be'capable of closeand accurate adjustment to the work, so that not only a better supportfor the tool, but also a greater range of adjustment of the samerelatively to the work is obtained; and for this purpose the inventionconsists of a tool-holder for lathes which comprises an upright postsupported by a base-plate, a clamping-plate placed on the base-plate, asecond clamping-plate placed on the post, clampingjaws on saidclamping-plates, means for ad justing the latter to the tool clampedbetween them, means for adjusting the upper clamping-plate on the post,and an auxiliary set-screw connecting the rear end of the upperclamping-plate for setting the latter to the size of the tool to beclamped between the jaws; and the invention consists, further, of

certain details of construction and combina-- tions of parts, which willbe fully described hereinafter and finally pointed out in the claims.

In the accompanying drawings, Figure 1 represents a side elevation of anenginelathe with myimproved tool-holder supported on the slide-rest ofthe same.- Fig. 2 is a side elevation of the slide -rest and toolholder,drawn on a larger scale. Fig. 3 is an end elevation of the tool-holder,drawn on a still larger scale. Fig. 4 is a plan view of Fig. 3. Fig. 5is a vertical transverse section on line 5 5, Fig. 3; and Fig. 6 is adetail Vertical transverse section of the upper portion of thesupporting-post and of the screwnut for tightening up the clamping-plateof the tool-holder.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents the slide-rest of anengine-lathe. The lower part a of the slide-rest is actuated in theusual manner by a screw-spindle G and'hand-wheel B, while the upper parta is transversely guided on the lower part a, by means of dovetailedguideways t and a screw-spindle B, so as to adjust the upper part of theslide-rest and the tool supported thereon to the proper relativeposition toward the work supported by the centers of the lathe.

My improved tool-holder is supported on the upper part a oftheslide-rest A by means of an upright post D, which is provided with abase-plate d, that is supported in a corresponding undercut recess ofthe upper portion a of the slide-rest, as shown in Fig. 3. On the upperportion a of the slide-rest is supported a lower clamping-plate E, whichis provided with an opening and is placed on the post D, while a secondclamping-plate E, provided with an opening corresponding to the diameterof the post D,'is also placed on the post D above the lowerclamping-plate E. A helical spring h is interposed between the twoclamping-plates. The faces of the clamping-plates E E are provided withconcave recesses for supporting-the convexlycurved sides of segmentaljaws F F, the faces of the jaws being serrated for gripping the tool tobe held between them. The lower clamping-plate E is connected by aguide-pin f with a recess f in the lower jaw F, so as to be guidedthereby on the clamping-plate into inclined position. The jaw F issimilarly adjusted and clamped to the clamping-plate E by aclampingscrew f which passes through an arc-shaped slot f in theclamping-plate, as shown clearly in Figs. 3 and 5. The clamping-block E,as well .as the clamping-plate' E, are provided with projections g 9,against which the tool abuts when it is placed between the serratedfaces ofthe jaws,

so as to be prevented from being moved fartherback than the projections.The upper end of the upright post D is screw-threaded, so that ascrew-nut D can be screwed down on the same, said screw-nut beingprovided with a convexly-curved lower part or base D that rests on awasher d and presses the latter on the upper face of the clamping-plateE, said washer being provided with a concaved upper face adjacentv tothe convex lower part or face D of the screw-nut D as shown clearly inFig. 6.

The clamping-plate E is made of approxi- IOO mately V or triangularshape and provided in the end opposite to its tool-holding end with aninteriorly-threaded hole 6 which is engaged by an auxiliary screw E thelower end of which is extended into a recess 6 of the lowerclamping-plate E, said recess being vertically below the hole 6 andextended iaterally for the purpose of giving sufficient play to theauxiliary screw E and also for keeping the recess clear of dust, chips,etc. The lower part of the auxiliary screw E is provided with ahexagonal shoulder, so as to permit the return of the auxiliary screw Eand the tight application of the upper clamping plate or jaw by means ofa wrench.

\Vhen a tool is to be placed between the jaws of the upper and lowerclamping-plates, the jaws adjust themselves to the proper inclination ofthe tool, as required by the work. The upper jaw is then clamped in itsproper position and the screw-nut D screwed down on the post, so as toclamp the tool firmly between the jaws F F. Between the clampingplates EE is interposed on the post D a helical spring h, which serves tosupport the upper clamping-plate, so as to raise it again as soon as thescrew-nut is turned in opposite direction on the threaded end of thepost D. While the jaws are clamped to the tool, the auxiliary screw E isin raised position in the upper clamping-plate E. The serrated faces ofthe clamping-jaws impart a firm hold on the shank of the tool, while theconvex face of the lower portion or base of the screw-nut D and theconcave face of the washer permit the ready adjustment of the upper jawto any slight inaccuracies or unevenness in the toolshank, so that thejaws cannot lose theirgrip on the same. When the tool is thus placed inproper position, the auxiliary screw E is turned down until it abutsagainst the lower clamping-plate, and the screw-nut D screwed down bythe wrench, so as to impart'the final clamping action to the tool andset thereby the tool-holder firmly and reliably to the work.

My improved tool-holder has the advantage of permitting the quick andconvenientadjustment of the tool close to the work with little strain onthe slide-rest and of holding the tool firmly and reliably in positionat any required angle of inclination required by the work to be done.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a tool-holder for engine-lathes, the combinationwith the slide-rest, of an upright post supported in the slide rest, alower clamping-plate supported on the slide-rest and post, an upperclamping-plate also supported on the post, means for adjusting the upperclamping-plate on the post, segmental jaws supported by theclamping-plates, means for adjusting the segmental jaws, projecting lugson the clam ping-plates between the post and segmental jaws for holdingthe tool in place, and an auxiliary screw engaging the ends of the upperand lower clamping-plates opposite the jaw-carrying ends, substantiallyas set forth.

2. In a tool-holder for engine-lathes, the combination, with an uprightpost supported in the slide-rest and provided with a threaded upper end,of a lower clamping-plate supported on said post and slide-rest andprovided with a lateral recess, an upper clamping-plate also supportedon the post, segmental jaws supported by the clampingplates, means foradjusting said jaws in the recessed faces of the clamping plates, atscrew-nut on said post, a washer interposed between the upperclamping-plate and screwnut, and an auxiliary screw between the ends ofthe upper and lower clamping-plates opposite to the jaw-carrying endsand located in the recess of the lower clamping-plate, substantially asset forth.

3. In a tool-holder for engine-lathes, the combination, with an uprightpost supported in the slide-rest and provided with a threaded upper end,of a lower clamping-plate supported 011 the slide-rest and the post, anupper clamping-plate supported on said post, a screw-nut on the upperthreaded end of said post, said screw-nut being provided with a conveXly-curved base, a washer interposed between the upper clamping-plateand the base of the screw-nut, said washer being provided with a concaveface adjacent to said base, and an auxiliary screw connecting the endsof the clamping-plates opposite the jawcarrying ends, substantially asset forth.

4. In a tool-holder for engine-lathes, the combination with an uprightpost supported in the slide-rest, of a lower clamping-plate supported onthe post and slide-rest and provided with a segmental recess and aprojection adjacent to said recess, an upper clamping-plate placed onthe post and also provided with a segmental recess and projectionadjacent to said recess, a helical spring interposed between the upperand lower clamping-plates, segmental jaws arranged in the recesses ofthe clamping-plates, means for adjusting said jaws, a screw-nut on theupper threaded end of the post, a washer between said screw-nut and theupper clamping-plate, and an auxiliary screw connecting the ends of theclamping-plates opposite to the jaw-carrying ends, substantially as setforth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

THOMAS E. TIE FENBACHER.

Witnesses:

HENRY J. SUHRBIER, O. P. GoEPEL.

